Party ideas?

uh okay so i'v got too much time on my hands and was thinking of having a party..

so any ideas? xD im gonna have it in my house..so there isn't that much space..but yeah..

and its just gopnna be us girls, oh yeah thats another factor. would it look weird if there arnt any boys? i prolly will be allowed boys but like, i dont know that many, and the ones i know i hate them xD and tbh i just want it to be a girls night. I know i sound like a douche but just wondering, would it be weird?

anyways, i need some ideas as to what we can do? :')xxxx i was thinking maybe a fancy dress party :3
or is that too childish? the people are gonna range from 13-15 :)